[rekhasharma]

What is the difference between chromophore and fluorophore? are they same?

[tefta10]

A chromophore is part (or moiety) of a molecule responsible for its color. The chromophore is the moiety that causes a conformational change of the molecule when hit by light.

A fluorophore, in analogy to a chromophore, is a component of a molecule which causes a molecule to be fluorescent. It is a functional group in a molecule which will absorb energy of a specific wavelength and re-emit energy at a different (but equally specific) wavelength.

[rekhasharma]

Ok... but chromophore also absorbs light and electron excites to higher energy level and so it emits colour. in fluorophore also this is happening, so whts the difference.

[Yggdrasil]

Chromophores often do not cause color by emitting light but by absorbing light (e.g. something that absorbs red and blue will appear green).  In these cases, the absorption of light excites electrons to higher energy levels but the electron relaxes to the ground state without releasing a photon (e.g. by giving off the excess energy as heat or transferring the energy to another molecule).